Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ea9c13e39e0e9f…

MALICIOUS

PDF

82.2 KB Created: 2021-03-31 11:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2273da5ac36cae3a95d9fcc6b56d5c33 SHA-1: 1d7cd00217e8f655f733ecdfcb73770031f6fb73 SHA-256: f0ea9c13e39e0e9f9d8e04ff425805d7f35088d47c12df78e91571f7cf0223d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=design+system+sketch+template PDF link annotation
    • http://egrn-order.online/addition_and_subtraction_worksheets_grade_1c432t.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/dC8T7gd/48629597399.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/ghazK1l/oklahoma_football_quarterback.pdfIn PDF document text
    • http://navaram.online/netovawilufanamjvuu.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/fjhgfEn/destiny_2_companion_app_leave_clan.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/hbfi1hg/zegagemekidenani.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/FDi3hfd/smartphone_tycoon_2_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/iid9iih/dudekifadusekegudogiweg.pdfIn PDF document text
    • http://retenenu.iblogger.org/zosoraxerakijezebulevesu.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/bMeciii/international_superstar_soccer_deluxe_snes_rom_hack.pdfIn PDF document text
    • http://trenketo.buzz/law_of_torts2amve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://navezep.epizy.com/canadian_sedentary_behaviour_guidelines_for_youth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0626e3a-239b-474d-bddb-aabf459d67fe/34026065947.pdfIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_2149919582b848b8a21860a8faf3a497.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_545589d52133462995d435aed3bb720d.pdf?index=trueIn PDF document text
    • http://bususetut.epizy.com/57553579578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24023ad-d1de-4598-8f5a-89154f4132fe/35885923184.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_7ce9afda16be401986c9c556f73b6c31.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_be92b0b6e7e04b5eb2382bcbdb0bb948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59dde5fa-a834-472f-81c6-3db161e659cb/bluedio_turbine_bluetooth_headphones_manual.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_93ef64d51d0848579cdb3d7a2fea6752.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ed8fed-8ee5-4a57-9587-75a716f55ba6/98104855989.pdfIn PDF document text
    • http://pezaruzij.rf.gd/celtic_alleluia_easter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e404dada-eb12-488b-af0e-b519c8d28d95/pentax_pz_70.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 5416 bytes
SHA-256: 282f0b7a834e5365dea2c26cd61d16d07d24bcd55aebdb24dc3b691f8924f361
font_01_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 10916 bytes
SHA-256: 8c7ee387208033491819874a1b67f6ea6a8c5c6bbc8bbbda07465f6ccaef5b32